MTD
Lawn & Garden Engine

Model # 478-SUC Official MTD engine

Here are the diagrams and repair parts for Official MTD 478-SUC engine, as well as links to manuals and error code tables, if available.

There are a couple of ways to find the part or diagram you need:

  • Click a diagram to see the parts shown on that diagram.
  • In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

We encourage you to save the model to your profile, so it’s easy to access parts and manuals for your appliance whenever you log in.

For DIY troubleshooting advice and repair guides, visit our repair help section.

Model diagram and schematic

SEARCH WITHIN THIS MODEL

?

This is the number corresponding to the part on the diagram / schematic

Search
ALL PARTS
Showing 10 of 141 parts  |

Lawn & Garden Equipment Engine Spark Plug 951-10292
#148

Cylinder head diagram

Lawn & garden equipment engine spark plug

Part #951-10292

Replaced by #951-10292A

?
Manufacturer substitution
This part replaces 951-10292. Substitute parts can look different from the original.
BEST SELLER
This item is not returnable
$6.47
60% OFF MSRP : $16.00
In Stock
Throttle Knob 951-10757
#3

Muffler & controls diagram

Throttle knob

Part #951-10757

Replaced by #951-11224

?
Manufacturer substitution
This part replaces 951-10757. Substitute parts can look different from the original.
This item is not returnable
$12.09
14% OFF Phone Price : $14.09
In Stock
Snowblower Ignition Switch (replaces 751-10637, 925-04031a) 951-10637
#5

Muffler & controls diagram

Snowblower ignition switch (replaces 751-10637, 925-04031a)

Part #951-10637

This item is not returnable
$18.67
10% OFF Phone Price : $20.67
In Stock
Lawn & Garden Equipment Engine Carburetor Float Bowl Gasket 951-11970
#U

Carburetor diagram

Lawn & garden equipment engine carburetor float bowl gasket

Part #951-11970

This item is not returnable
$10.46
16% OFF Phone Price : $12.46
In Stock
Lawn & Garden Equipment Engine Carburetor Primer Bulb 951-11824
#174

Carburetor diagram

Lawn & garden equipment engine carburetor primer bulb

Part #951-11824

This item is not returnable
$17.13
10% OFF Phone Price : $19.13
In Stock
Lawn & Garden Equipment Engine Rocker Arm 951-11966
#159

Cylinder head diagram

Lawn & garden equipment engine rocker arm

Part #951-11966

This item is not returnable
$12.82
13% OFF Phone Price : $14.82
In Stock
Lawn Tractor Engine Oil Drain Pipe (replaces 751-11350) 951-11350
#112

Crankcase diagram

Lawn tractor engine oil drain pipe (replaces 751-11350)

Part #951-11350

This item is not returnable
In Stock
Lawn & Garden Equipment Engine Fuel Bowl Mounting Bolt 710-04945
#X

Carburetor diagram

Lawn & garden equipment engine fuel bowl mounting bolt

Part #710-04945

This item is not returnable
$6.46
13% OFF Phone Price : $7.46
In Stock
Lawn & Garden Equipment Engine Flywheel Key 951-10307
#90

Crankcase diagram

Lawn & garden equipment engine flywheel key

Part #951-10307

Replaced by #751P10307A

?
Manufacturer substitution
This part replaces 951-10307. Substitute parts can look different from the original.
This item is not returnable
$3.22
24% OFF Phone Price : $4.22
In Stock
Lawn & Garden Equipment Engine Choke Control Knob 951-11302
#8

Muffler & controls diagram

Lawn & garden equipment engine choke control knob

Part #951-11302

In Stock

Symptoms for gas leaf blowers

Choose a symptom to see related leaf blower repairs.

Main causes: cracked fuel lines, leaky carburetor seals, damaged fuel tank cap, cracked fuel tank…

Main causes: damaged fan blade, engine needs a tune up, dirty carburetor…

Main causes: stale fuel, dirty air filter, bad spark plug, cracked fuel lines, clogged carburetor…

Main causes: mixing too much 2-cycle oil with the gas, dirty air filter, clogged carburetor, engine needs tune up…

Main causes: bad gas, clogged air filter, cracked fuel lines, clogged fuel filter, dirty carburetor, bad spark plug, wor…

Repair guides for gas leaf blowers

These step-by-step repair guides will help you safely fix what’s broken on your leaf blower.

How to replace a leaf blower carburetor

How to replace a leaf blower carburetor

The carburetor could be the problem If the leaf blower engine won't start even though there's fuel in the tank. Follow t…

Repair difficulty
Time required
 15 minutes or less
How to replace leaf blower fuel lines

How to replace leaf blower fuel lines

Leaf blower fuel lines deteriorate with time and eventually can split or crack. You can remove and replace them yourself…

Repair difficulty
Time required
 60 minutes or less
How to rebuild a leaf blower carburetor

How to rebuild a leaf blower carburetor

If the leaf blower engine won't start even though there's fuel in the tank, the carburetor could be the problem. Follow …

Repair difficulty
Time required
 60 minutes or less

Effective articles & videos to help repair your lawn & garden engines

Use the advice and tips in these articles to get the most out of your leaf blower.

Top questions about Sears and Sears PartsDirect

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

What are the main components of a lawn mower?

What are the main components of a lawn mower?

Learn about the main parts of a lawn mower and when to replace parts.…